[JS IR] Fix arrayOfNulls API

libraries/stdlib/js-ir/builtins/Library.kt

@@ -6,6 +6,7 @@
 package kotlin
 
 import kotlin.internal.PureReifiable
+import kotlin.js.*
 
 /**
  * Returns a string representation of the object. Can be called with a null receiver, in which case
@@ -24,7 +25,7 @@ public operator fun String?.plus(other: Any?): String =
 /**
  * Returns an array of objects of the given type with the given [size], initialized with null values.
  */
-public inline fun <reified T> arrayOfNulls(size: Int): Array<T?> = Array<T?>(size)
+public inline fun <reified T> arrayOfNulls(size: Int): Array<T?> = fillArrayVal<T?>(Array<T?>(size), null)
 
 /**
  * Returns an array containing the specified elements.

libraries/stdlib/js-ir/runtime/arrays.kt

@@ -9,6 +9,7 @@ import withType
 
 external fun <T> Array(size: Int): Array<T>
 
+@PublishedApi
 internal fun <T> fillArrayVal(array: Array<T>, initValue: T): Array<T> {
     for (i in 0..array.size - 1) {
         array[i] = initValue